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I've used these cranks on BB30 frames in the past with no issues. (and the Specialized MTB crank on PF30 frames) However, I seem to be running into problems this time around. I think the carbon spider is too bulky and is rubbing again't the frame and PF30 cup. If I space the DS crank arm out enough to clear, then the NDS arm is too close to the chain stay.

I'm going to mess with it a bit more... but just wanted to see if anyone else was trying this. It's a really light crank with good stiffness. But, if it won't work... it won't work. Perhaps the Aluminum spider is thinner or more relieved on the back side, allowing for the DS arm to be closer to the BB?

Mind if I ask what spider you used? I think a lot of my problem is from the Specialized carbon spider, which is quite thick. The Aluminum spider gives me at least another MM of space. But it's still tight on this frame.

I have used the MTB cranks on BB30 and PF30 bikes for years with no issues.

I have also used the Specialized on BB30 frames with no issue. It seems the PF30 BB cups are the problem. The spider rubs the lip of the cup and the NDS arm's metal support near the spindle rubs the inside of the cup and the lip of the cup (very slightly). The proximity of the thick carbon spider to the DS cup don't allow me to space it further to the NDS.

I actually got it working by machining off the outer portion of the DS PF30 BB cup to gain extra clearance. But, I might have issues with the bearing and cup creeping inward to the NDS, since there is nothing fixing it's position now.

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